Infrared photodiodes based on Type-II strained layer superlattices

Sankha D. Das; Yu Ling Goh; Chee Hing Tan; John Paul R. David; Jean-Baptiste Rodriguez; Elena A. Plis; Yagya D. Sharma; Ha Sul Kim; Sanjay Krishna

doi:10.1117/12.802203

2 October 2008 Infrared photodiodes based on Type-II strained layer superlattices

Sankha D. Das, Yu Ling Goh, Chee Hing Tan, John Paul R. David, Jean-Baptiste Rodriguez, Elena A. Plis, Yagya D. Sharma, Ha Sul Kim, Sanjay Krishna

Author Affiliations +

Proceedings Volume 7113, Electro-Optical and Infrared Systems: Technology and Applications V; 71130I (2008) https://doi.org/10.1117/12.802203
Event: SPIE Security + Defence, 2008, Cardiff, Wales, United Kingdom

Abstract

The InAs/GaSb Type II strained layer superlattice (SLS) is promising III-V material system for infrared (IR) devices due to the ability to engineer its bandgap between 3-30 μm and potentially have many advantages over current technologies such as high uniformity smaller leakage current due to reduced Auger recombination which are crucial for large IR focal plane arrays. However, an issue with this material system is that it relies on growth on GaSb substrates. These substrates are significantly more expensive than silicon, used for HgCdTe detectors, lower quality and are only available commercially as 3" diameters. Moreover it has to go through thinning down before it could be hybridized to readout integrated circuits. GaAs substrate is a possible alternative. We report on growth and characterisation of Type-II InAs/GaSb SLS photodiodes grown on GaAs substrates for mid-wave infrared with peak responses of 3.5 μm at 77K and 4.1 μm at 295K. Comparisons with similar structure grown on GaSb substrates show similar structural, optical and electrical characteristics. Broadening of X-ray rocking curves were observed on the structure grown on GaAs substrate. A full width half maximum (FWMH) of 25.2 arc sec. for the superlattice was observed near ~30.4 degree for the structure on GaSb substrate compared to near ~30.4 degree for structure grown on GaAs. However peak responsivity values of ~ 1.9 A/W and ~ 0.7 A/W were measured at 77K and 295K for devices grown on GaAs substrate. Room temperature responsivity suggests that these photodiodes are promising as high temperature IR detectors.

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Sankha D. Das, Yu Ling Goh, Chee Hing Tan, John Paul R. David, Jean-Baptiste Rodriguez, Elena A. Plis, Yagya D. Sharma, Ha Sul Kim, and Sanjay Krishna "Infrared photodiodes based on Type-II strained layer superlattices", Proc. SPIE 7113, Electro-Optical and Infrared Systems: Technology and Applications V, 71130I (2 October 2008); https://doi.org/10.1117/12.802203

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KEYWORDS

Gallium antimonide

Gallium arsenide

Superlattices

Laser sintering

Photodiodes

Mercury cadmium telluride

Mid-IR

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